In Blender 3d, how do I start or change a wind force in a scene?
Most values displayed in the properties can be keyframed. This includes the Strength, Flow and Noise for Force Fields.

With the mouse over the field press I or right click and select Insert Keyframe.

For more variation you can add a noise modifier to the value in the graph editor. Press N to show the properties sidebar to find the modifiers panel.